1SOLAR COLLECTOR 2SOLAR KEYMARK, SRCC, CE, SGS, ISO9001-2000 3vacuum tube 4heat pipe vacuum tube heat pipecollector 1. Spcification of solar collector out casing: aluminium alloy inner manifold: red copper insulation layer:rock wool/polyurethane foam vacuum tube: 58*1800mm, ALN/AIN-SS/CU 1.6mm thickness heat pipe: red copper, anti-frizen, 1700mm length frame: aluminium alloy angle: according to ...